Jet Lag
How do you get over it.
RETIRE, and only travel "F" and break your journey for at least 2 nights when travelling East, suggest KUL.
Westbound doesn't hurt, in my opinion.
Paxing BNE to LHR, no prob's, once again, my opinion.
Cheers
robroy
PS, I agree with Keg, if you haven't retired.